Dynamic apps and custom watchfaces

Verification

• I searched for similar feature request and found none was relevant.

Pitch us your idea!

I want to install new watchfaces and apps without flashing the whole firmware

Description

InfiniTime is currently a monolithic firmware : everything is built into a single binary file : OS, drivers, applications & watchfaces, fonts, pictures,...

This feature request is about adding the possibility to create and install new watchfaces and app without having to rebuild and flash the whole firmware.

InfiniTime is not quite ready yet to support these features, but we are slowly but surely moving forward to that:

• The PineTime is equipped with a huge 4MB SPI flash memory
• We've already implemented a filesystem (based on LittleFS on that SPI flash memory
• We've also implemented a BLE FS API to allow companion apps to access to this FS via BLE
• We are working on [moving assets fonts and picture to that external memory

There's of course still a lot of researches, experiments and work to do before we can enable dynamic app and custom watchfaces.

Over the time, a few feature requests on this topic were opened, and I create this one to group them all.
Those existing feature requests are :

• https://github.com/InfiniTimeOrg/InfiniTime/issues/113
• https://github.com/InfiniTimeOrg/InfiniTime/issues/421
• https://github.com/InfiniTimeOrg/InfiniTime/issues/755
• https://github.com/InfiniTimeOrg/InfiniTime/issues/1055

Start by reviewing the filesystem in PR #438, the BLE FS API in PR #756, and the asset-migration work in issue #321, then read the related requests #113, #421, #755, and #1055. Done would require a defined and tested way to install and run apps and watchfaces without reflashing the full firmware.